Appendix a - technical specifications, Appendix a — technical specifications – NorthStar Navigation 491 User Manual

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491 INSTALLATION MANUAL Revision A

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APPENDIX A — Technical specifications

Table 8: 491 technical specifications

Performance characteristics

Frequencies

50 and 200 kHz

Output power

1000 watts with dual-element transducers
600 watts with single-element transducers

Pulse lengths

0.1 to 2 ms

Pulse repetition rate

30 to 600 pulses/min

Alarms

Fish, bottom, and temperature

Update rate

10 Hz maximum (depends on water depth)
(up to 20Hz when used with the Northstar
6000i)

Zoom modes

Marker, bottom lock, bottom lock/center,
bottom

Auto modes

Fishing or cruising

Navigation data

Shown on bottom of screen

Display modes

Single/dual frequency, split-screen, four
zoom modes, A-Scope

Physical characteristics

Dimensions

8.78 x 7.22 x 2.35 inches (including back-
plate)

Weight

2 pounds

Environmental characteristics

Temperature

-25˚C to +60˚C operating temperature
-55˚C to +90˚C storage temperature

Standards

Waterproof, sealed design meets the follow-
ing: EN60529 IP65; EN60945 emissions; CE

Electrical characteristics

8 to 36 VDC, 8 watts, reverse polarity and
overvoltage protection
Transducer outputs protected against open
circuit/short circuit

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